text: /* log.c - logging helpers */
  
  /*
   * Copyright (c) 2016 Intel Corporation
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  /* Helper for printk parameters to convert from binary to hex.
   * We declare multiple buffers so the helper can be used multiple times
   * in a single printk call.
   */
  
  #include <stddef.h>
  #include <stdint.h>
  #include <nanokernel.h>
  #include <misc/util.h>
  
  #include <bluetooth/log.h>
  
  const char *bt_hex(const void *buf, size_t len)
  {
  	static const char hex[] = "0123456789abcdef";
  	static char hexbufs[4][129];
  	static uint8_t curbuf;
  	const uint8_t *b = buf;
  	unsigned int mask;
  	char *str;
  	int i;
  
  	mask = irq_lock();
  	str = hexbufs[curbuf++];
  	curbuf %= ARRAY_SIZE(hexbufs);
  	irq_unlock(mask);
  
  	len = min(len, (sizeof(hexbufs[0]) - 1) / 2);
  
  	for (i = 0; i < len; i++) {
  		str[i * 2]     = hex[b[i] >> 4];
  		str[i * 2 + 1] = hex[b[i] & 0xf];
  	}
  
  	str[i * 2] = '\0';
  
  	return str;
  }
  